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Updated: Sep 2, 2026

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
Published on: December 16, 2022
Commercial Fluid Catalytic Cracking Catalysts for Polymers Chemical Recycling
Oliwia Rogala1,2, Karolina A Tarach1, Agata Kordek1,2
1Faculty of Chemistry, Jagiellonian University in Kraków, Kraków, Poland.
Abstract:
Commercial FCC catalysts (fresh and equilibrated) and laboratory made catalysts from Y type zeolite and γ-Al2O3 are characterized by standard techniques and evaluated in the cracking of pure PP, LDPE, and PS polymers as well as coprocessing PP/LDPE mixture in TGA (light-off curves) and a unique operando FTIR & GC-MS set-up. Conversions, products selectivities as well as coke deposition and removal are studied as a function of temperature. In spectroscopic operando investigations, MCR-ALS analysis provides significant insight into the observed results. The equilibrium FCC catalyst (Cat-Eq800) differs markedly from its fresh counterpart (Cat-F800) in product selectivity. Regardless of the polyolefin feed, Cat-Eq800 exhibits higher olefinicity in the C4 fraction. In both commercial catalysts, coke precursor formation proceeds predominantly via paraffin consumption. In situ FTIR analysis revealed valuable information regarding reactant diffusion and catalyst acidity. Despite undergoing severe deactivation treatments, the equilibrium catalyst displays the highest Brønsted-to-Lewis acid site ratio while maintaining efficient mass transport through its hierarchical pore structure. Important information to better design FCC catalysts can be derived, as the exact composition of these important catalysts are often tailored for specific families of heavy oil fractions.
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